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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2012 Red Hat, Inc.
* Copyright (C) 2012 Giovanni Campagna <scampa.giovanni@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib-object.h>
#include <gio/gio.h>
#ifdef WITH_SYSTEMD
#include <systemd/sd-login.h>
#endif
#include "common/gdm-common.h"
#include "gdm-user-switching.h"
#include "gdm-client.h"
static gboolean
create_transient_display (GDBusConnection *connection,
GCancellable *cancellable,
GError **error)
{
GVariant *reply;
const char *value;
reply = g_dbus_connection_call_sync (connection,
"org.gnome.DisplayManager",
"/org/gnome/DisplayManager/LocalDisplayFactory",
"org.gnome.DisplayManager.LocalDisplayFactory",
"CreateTransientDisplay",
NULL, /* parameters */
G_VARIANT_TYPE ("(o)"),
G_DBUS_CALL_FLAGS_NONE,
-1,
cancellable, error);
if (reply == NULL) {
g_prefix_error (error, _("Unable to create transient display: "));
return FALSE;
}
g_variant_get (reply, "(&o)", &value);
g_debug ("Started %s", value);
g_variant_unref (reply);
return TRUE;
}
#ifdef WITH_SYSTEMD
static gboolean
activate_session_id_for_systemd (GDBusConnection *connection,
GCancellable *cancellable,
const char *seat_id,
const char *session_id,
GError **error)
{
GVariant *reply;
reply = g_dbus_connection_call_sync (connection,
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"ActivateSessionOnSeat",
g_variant_new ("(ss)", session_id, seat_id),
NULL,
G_DBUS_CALL_FLAGS_NONE,
-1,
cancellable, error);
if (reply == NULL) {
g_prefix_error (error, _("Unable to activate session: "));
return FALSE;
}
g_variant_unref (reply);
return TRUE;
}
static gboolean
get_login_window_session_id_for_systemd (const char *seat_id,
char **session_id)
{
gboolean ret;
int res, i;
char **sessions;
char *service_id;
char *service_class;
char *state;
res = sd_seat_get_sessions (seat_id, &sessions, NULL, NULL);
if (res < 0) {
g_debug ("Failed to determine sessions: %s", strerror (-res));
return FALSE;
}
if (sessions == NULL || sessions[0] == NULL) {
*session_id = NULL;
ret = TRUE;
goto out;
}
for (i = 0; sessions[i]; i ++) {
res = sd_session_get_class (sessions[i], &service_class);
if (res < 0) {
g_debug ("failed to determine class of session %s: %s", sessions[i], strerror (-res));
ret = FALSE;
goto out;
}
if (strcmp (service_class, "greeter") != 0) {
free (service_class);
continue;
}
free (service_class);
ret = sd_session_get_state (sessions[i], &state);
if (ret < 0) {
g_debug ("failed to determine state of session %s: %s", sessions[i], strerror (-res));
ret = FALSE;
goto out;
}
if (g_strcmp0 (state, "closing") == 0) {
free (state);
continue;
}
free (state);
res = sd_session_get_service (sessions[i], &service_id);
if (res < 0) {
g_debug ("failed to determine service of session %s: %s", sessions[i], strerror (-res));
ret = FALSE;
goto out;
}
if (strcmp (service_id, "gdm-launch-environment") == 0) {
*session_id = g_strdup (sessions[i]);
ret = TRUE;
free (service_id);
goto out;
}
free (service_id);
}
*session_id = NULL;
ret = TRUE;
out:
if (sessions) {
for (i = 0; sessions[i]; i ++) {
free (sessions[i]);
}
free (sessions);
}
return ret;
}
static gboolean
goto_login_session_for_systemd (GDBusConnection *connection,
GCancellable *cancellable,
GError **error)
{
gboolean ret;
int res;
char *our_session;
char *session_id;
char *seat_id;
ret = FALSE;
session_id = NULL;
seat_id = NULL;
/* First look for any existing LoginWindow sessions on the seat.
If none are found, create a new one. */
/* Note that we mostly use free () here, instead of g_free ()
* since the data allocated is from libsystemd-logind, which
* does not use GLib's g_malloc (). */
res = sd_pid_get_session (0, &our_session);
if (res < 0) {
g_debug ("failed to determine own session: %s", strerror (-res));
g_set_error (error, GDM_CLIENT_ERROR, 0, _("Could not identify the current session."));
return FALSE;
}
res = sd_session_get_seat (our_session, &seat_id);
free (our_session);
if (res < 0) {
g_debug ("failed to determine own seat: %s", strerror (-res));
g_set_error (error, GDM_CLIENT_ERROR, 0, _("Could not identify the current seat."));
return FALSE;
}
res = sd_seat_can_multi_session (seat_id);
if (res < 0) {
free (seat_id);
g_debug ("failed to determine whether seat can do multi session: %s", strerror (-res));
g_set_error (error, GDM_CLIENT_ERROR, 0, _("The system is unable to determine whether to switch to an existing login screen or start up a new login screen."));
return FALSE;
}
if (res == 0) {
free (seat_id);
g_set_error (error, GDM_CLIENT_ERROR, 0, _("The system is unable to start up a new login screen."));
return FALSE;
}
res = get_login_window_session_id_for_systemd (seat_id, &session_id);
if (res && session_id != NULL) {
res = activate_session_id_for_systemd (connection, cancellable, seat_id, session_id, error);
if (res) {
ret = TRUE;
}
}
if (! ret && g_strcmp0 (seat_id, "seat0") == 0) {
res = create_transient_display (connection, cancellable, error);
if (res) {
ret = TRUE;
}
}
free (seat_id);
g_free (session_id);
return ret;
}
#endif
gboolean
gdm_goto_login_session_sync (GCancellable *cancellable,
GError **error)
{
GDBusConnection *connection;
gboolean retval;
connection = g_bus_get_sync (G_BUS_TYPE_SYSTEM, cancellable, error);
if (!connection)
return FALSE;
#ifdef WITH_SYSTEMD
if (LOGIND_RUNNING()) {
retval = goto_login_session_for_systemd (connection,
cancellable,
error);
g_object_unref (connection);
return retval;
}
#endif
return FALSE;
}
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